Where is my Clippings data stored?

You can look this up from Clippings Manager by clicking Tools → Data Source Settings, then looking at Data Source Location in the Clippings preferences dialog (Data Source tab).

Starting with Clippings 4.0, the default data source location is your Firefox or Thunderbird profile location. However, this can be changed from the extension preferences dialog (Data Source tab).

I want to change my data source location. Will my clippings move to the new data source automatically?

No. If you want to move your clippings to a new data source location, export your clippings first (Tools → Export from Clippings Manager). After changing the data source location from the Clippings preferences dialog (Tools → Data Source Settings), import the clippings that you had exported (Tools → Import from Clippings Manager).

I just changed my data source location, but my clippings have disappeared. Help!

In Clippings Manager, select Tools → Data Source Settings, then change the location back to the previous setting. Your clippings should remain intact. Afterwards, follow the instructions in the answer to the previous question.

If I uninstall Clippings, will I lose my Clippings data?

No. The extension is installed in a location separate from your clippings
data. Your clippings data will be left intact after the uninstall in
case you want to reinstall Clippings later.

How do I transfer my clippings to a different computer?

Follow these steps:

Use the Export command in Clippings Manager (Options → Export) to export your clippings data to a file. Select Clippings File in the list of available export formats.

On the computer where you want to transfer your clippings data, install Clippings in the desired host application (Firefox and/or Thunderbird).

Copy the file exported in step 1 and note the location where you copied the file to.

I upgraded Firefox or Thunderbird, and Clippings doesn't work anymore!

You may have an older version of Clippings that wasn't updated. Choose
Tools → Add-ons, select Clippings in the list of extensions, and
right-click and select Find Update.

Please note that nightly builds and alpha releases of Firefox and
Thunderbird are not supported. Beta releases may be supported once Clippings
has been tested on them and is confirmed to be working without significant
regressions.

I don't like the CTRL+ALT+V (or Command+Option+V on Mac OS X) keyboard binding for invoking clipping paste using a shortcut key. Can I change it?